From: Ingo Molnar <mingo@elte.hu>
Date: Tue, 16 Jun 2009 14:11:14 +0000 (+0200)
Subject: dma-debug: Put all hash-chain locks into the same lock class
X-Git-Tag: v2.6.31-rc3~31^2~4^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b0a5b83ee0fce9dbf8ff5fe1f8c9ae7dfafe458c;p=pandora-kernel.git

dma-debug: Put all hash-chain locks into the same lock class

Alan Cox reported that lockdep runs out of its stack-trace entries
with certain configs:

 BUG: MAX_STACK_TRACE_ENTRIES too low

This happens because there are 1024 hash buckets, each with a
separate lock. Lockdep puts each lock into a separate lock class and
tracks them independently.

But in reality we never take more than one of the buckets, so they
really belong into a single lock-class. Annotate the has bucket lock
init accordingly.

[ Impact: reduce the lockdep footprint of dma-debug ]

Reported-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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